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Subaru Legacy Service Manual: Dtc c1422 vdc interruption for engine convenience

DTC DETECTING CONDITION:

A fault is detected if engine control prohibition flag from ECM is received.

TROUBLE SYMPTOM:

VDC does not operate.

Hill hold does not function.

NOTE:

The warning light goes off if the engine control prohibition flag from ECM returns normally.

STEPCHECKYESNO

1.CHECK COOPERATION CONTROL FEASIBILITY OF ECM USING SUBARU SELECT MONITOR.

1) Start the engine, and run the engine at idle approximately 5 minutes.

2) Using the Subaru Select Monitor, select “Data monitor”. Subaru Select Monitor > OPERATION

3) Check the «E/G Torque Down Control Stop Flag» displayed on screen.

Does the «E/G Torque Down Control Stop Flag» indicate “1”-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE

2.CHECK WARNING LIGHT.

Check whether the VDC warning light illuminates after driving for 1 minute or more at a speed of 10 km/h (6 MPH) or more.

Does the VDC warning light illuminate-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE

VDC is normal. Perform the Clear Memory Mode. Clear Memory Mode

NOTE:

DTC may be recorded if cranking is performed during driving.

3.CHECK POOR CONTACT OF CONNECTORS.

Is there poor contact of ECM connector-

Repair the connector.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE

4.CHECK ENGINE SYSTEM.

Refer to the basic diagnostic procedure of ENGINE (DIAGNOSTICS).

Is ECM normal-

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE

Check the engine system.

5.CHECK VDCCM&H/U.

1) Connect all connectors.

2) Perform the Clear Memory Mode. Clear Memory Mode

3) Perform the Inspection Mode. Inspection Mode

4) Read the DTC. Read Diagnostic Trouble Code (DTC)

Is the same DTC displayed-

Replace the VDCCM&H/U. VDC Control Module and Hydraulic Control Unit (VDCCM&H/U)

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE

6.CHECK DETECTION OF OTHER DTCS FOR VDC.

Read Diagnostic Trouble Code (DTC)

Is any other DTC displayed-

Perform the diagnosis according to DTC. List of Diagnostic Trouble Code (DTC)

Currently, it is normal. There may have been a poor contact in the harness and connector or a temporarily noise interference.

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